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Strax, flanked by Madame Vastra and Jenny, begins by singing "Santa Claus is Coming to Town," but soon turns the carol into a warning that a Sontaran warrior is coming to reduce the listener into atoms.

The next song he sings is "When the Red, Red Robin (Comes Bob, Bob, Bobbin' Along)" and ends by saying that "I use the twittering avian for target practice!" At this point the Eleventh Doctor and Clara pops up behind him and the Doctor says, "Strax, Christmas is fun. Come on, now" and rubs his bald head.

In the last scene, Strax sings "Rudolph the Red-Nosed Reindeer" and exclaims that Rudolph's nose was a tactical disadvantage, as it also allowed Strax to punch him in the dark. Everyone, including the crew, break character and start laughing.

This story bears a striking similarity to the 1978 sketch Merry Christmas Doctor Who. Both were made for or at Christmas as a joke, both break the fourth wall, and both end with the cast and crew bursting out laughing.